(Indicate by check mark whether
the registrant files or will file annual reports under cover of form 20-F or Form 40-F.)

Form
20-F V Form 40-F

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes No V

(If Yes is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): Not applicable )

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

United Microelectronics Corporation

Date: 12/20/2006

By

/s/ Chitung Liu

Chitung Liu

Chief Financial Officer

www.umc.com

Exhibit

Exhibit

Description

99.1

Announcement on November 16, 2006: To announce related materials on acquisition of machinery and equipment

99.2

Announcement on November 20, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.3

Announcement on November 23, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.4

Announcement on November 27, 2006: To clarify reports on Commercial Times on November 27, 2006

99.5

Announcement on November 29, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.6

Announcement on December 4, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.7

Announcement on December 5, 2006: To announce UMC will attend investor conferences from 2006/12/6 to 2006/12/7

99.8

Announcement on December 7, 2006: November Revenue

99.9

Announcement on December 7, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.10

Announcement on December 8, 2006: Represent subsidiary TLC Capital Co, Ltd. to announce the disposal of Power Quotient International

99.11

Announcement on December 8, 2006: To announce related materials on disposal of Promos Technologies common shares

99.12

Announcement on December 13, 2006: To announce related materials on disposal of MediaTek Incorporation securities

99.13

Announcement on December 15, 2006: 1) the trading and pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders of UMC 2) the acquisition and disposition of
assets by UMC

99.14

Announcement on December 18, 2006: To announce related materials on disposal of MediaTek Incorporation securities

Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the
trading counterpart is not required to be disclosed): APPLIED MATERIALS ASIA PACIFIC LTD; non-related party transaction

5.

Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the
identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition: Not applicable

6.

Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of
acquisition and disposal by the related person and the persons relationship to the company at those times: Not applicable

7.

Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):
Not applicable

8.

Terms of delivery or payment (including payment period and monetary amount): 1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance

9.

The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making
department: transaction: price negotiation; the reference basis for the decision on price: market price. The decision-making department: the Selection Meeting

10.

Name of the professional appraisal institution and its appraisal amount: Not applicable

11.

Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA: Not applicable

12.

Is the appraisal report price a limited price or specific price? Not applicable

13.

Has an appraisal report not yet been obtained? Not applicable

14.

Reason an appraisal report has not yet been obtained: Not applicable

15.

Broker and brokers fee: Not applicable

16.

Concrete purpose or use of the acquisition or disposition: to produce integrated circuits

17.

Do the directors have any objection to the present transaction?: no

18.

Any other matters that need to be specified: none

Exhibit 99.2

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To announce related materials on disposal of MediaTek Incorporation securities

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 23,499,499 shares; amount: 243,065,558 NTD; percentage of holdings: 2.43 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.40 %; ratio of shareholders equity: 17.96 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

9.

Do the directors have any objections to the present transaction? no

10.

Any other matters that need to be specified: none

Exhibit 99.3

www.umc.com

To announce related materials on disposal of MediaTek Incorporation securities

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 22,575,499 shares; amount: 233,508,224 NTD; percentage of holdings: 2.33 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.41 %; ratio of shareholders equity: 17.97 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 21,379,499 shares; amount: 221,137,475 NTD; percentage of holdings: 2.21 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.37 %; ratio of shareholders equity: 17.91 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

9.

Do the directors have any objections to the present transaction? no

10.

Any other matters that need to be specified: none

Exhibit 99.6

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To announce related materials on disposal of MediaTek Incorporation securities

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 20,369,499 shares; amount: 210,690,606 NTD; percentage of holdings: 2.10 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.39 %; ratio of shareholders equity: 17.95 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 19,449,499 shares; amount: 201,174,645 NTD; percentage of holdings: 2.01 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.45 %; ratio of shareholders equity: 18.02 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights
(e.g.pledges): cumulative volume:0 shares; amount: NTD 0; percentage of holdings:0%; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets:75.25% ratio of shareholders equity:75.98%; the operational capital as shown in the most recent financial statement: $1,635,330
thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

9.

Do the directors have any objections to the present transaction?: none

Relationship with the underlying company of the trade: Promos Technologies, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights
(e.g.pledges): cumulative volume: 484,374,000 shares; amount:6,281,564,685 NTD; percentage of holdings:7.99%; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.26%; ratio of shareholders equity: 17.78%; the operational capital as shown in the most recent financial statement: $86,701,109
thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

9.

Do the directors have any objections to the present transaction?: none

10.

Any other matters that need to be specified: none

Exhibit 99.12

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To announce related materials on disposal of MediaTek Incorporation securities

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 18,419,499 shares; amount: 190,520,906 NTD; percentage of holdings: 1.90%; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.21 %; ratio of shareholders equity: 17.71 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation

This is to report 1) the trading of directors, supervisors, executive
officers and 10% shareholders of United Microelectronics Corporation (UMC) (NYSE: UMC) 2) the pledge and clear of pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders of UMC 3) the acquisition
assets by UMC 4) the disposition of assets by UMC for the month of November, 2006.

1)

The trading of directors, supervisors, executive officers and 10% shareholders

Title

Name

Number of sharesheld as
of

October 31, 2006

Number of sharesheld as
of

November 30, 2006

Changes

Vice President

Fu-Tai Liou

5,703,944

5,553,944

(150,000

)

Vice President

Shih-Wei Sun

14,555,644

14,522,644

(33,000

)

Vice President

Henry Liu

11,892,588

11,812,588

(80,000

)

Vice President

Nick Nee

3,030,236

2,910,236

(120,000

)

Vice President

Ying-Chih Wu

12,032,001

11,982,001

(50,000

)

Vice President

Lee Chung

461,546

431,546

(30,000

)

Vice President

Chia-Pin Lee

941,010

926,010

(15,000

)

Vice President

Po-Wen Yen

1,312,551

1,172,551

(140,000

)

2)

The pledge and clear of pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders:

Title

Name

Number of sharespledge as
of

October 31, 2006

Number of sharespledge as
of

November 30, 2006

Changes











3)

The acquisition assets (NT$ Thousand)

Description of assets

November

2006

Semiconductor Manufacturing Equipment

3,419,212

28,408,807

Fixed assets

70,989

432,727

4)

The disposition of assets (NT$ Thousand)

Description of assets

November

2006

Semiconductor Manufacturing Equipment

20

212,851

Fixed assets

0

0

Exhibit 99.14

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To announce related materials on disposal of MediaTek Incorporation securities

Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6.

Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g.
pledges): cumulative volume: 17,389,499 shares; amount: 179,867,168 NTD; percentage of holdings: 1.80 %; status of restriction of rights: no

7.

Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholders equity as shown in the most recent financial
statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 14.24 %; ratio of shareholders equity: 17.75 %; the operational capital as shown in the most recent financial statement: $
86,701,109 thousand NTD

8.

Concrete purpose/objective of the acquisition or disposal: financing operation